Screws for a Compaq Portable keyboard

[David Griffith via cctalk]

Would someone please suggest a suitable screw specification for the Compaq 
Portable keyboard?  My restoration project was interrupted and I managed 
to lose the screws.



--
David Griffith
d...@661.org

A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

DECnet/10 manuals?

[Paul Koning via cctalk]

I'm looking for a manual I can't find on Bitsavers: a DECnet/10 programming 
manual.  The reason: trying to read PSTHRU.MAC and realizing that I was trying 
to understand DECnet-10 code while reading the DECnet-20 programming manual.  
Oops.

paul

Re: Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

Indeed it is!

Are you in the Manchester, NH area?

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Jan 20, 2022, at 12:34 PM, Ed C.  wrote:
> 
> I'll take it if still available. 
> 
> Ed
> 
> On Thu, Jan 20, 2022 at 6:26 PM Stephen Pereira via cctech 
> mailto:cct...@classiccmp.org>> wrote:
> I am in the process of thinning down my vintage computer holdings, to relieve 
> some of the burden I will leave to my heirs (hopefully not too soon!).
> 
> I have a working tiny PDP-11/73 system available for sale.  I would much 
> prefer not to have to break it down and pack it for shipping, but I will if 
> the buyer agrees to pay for the packing and shipping costs.
> 
> - - - - -
> 
> Tiny PDP-11/73 System:
> 
> H9281-BA backplane and card cage
> KDJ11-A CPU
> DLV11-J 4 port SIO
> MSV11-LK 256KB/128KW memory
> Emulex UC07 SCSI interface
> 
> Power-on Reset board from here:
> http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por 
>  
>  >
> 
> SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed
> 
> MeanWell RT-125B power supply
> 
> 4.5 inch AC fan
> 
> qty 4 GlitchWorks serial cables
> 
> Spare PDP-11/23 CPU saved as a backup:
> KDF11-AB CPU
> 
> RT-11 Pocket Guide
> 
> RT-11 Mini-Reference Manual
> 
> - - - - -
> 
> I am asking $800.00 for the lot.  It cost me about that, probably more to 
> acquire it piece-by-piece and assemble it into a working system.
> 
> smp
> - - -
> Stephen Pereira
> Bedford, NH  03110
> KB1SXE
> 
> 

Re: Tiny PDP-11/73 system for sale

[Ed C. via cctalk]

I'll take it if still available.

Ed

On Thu, Jan 20, 2022 at 6:26 PM Stephen Pereira via cctech <
cct...@classiccmp.org> wrote:

> I am in the process of thinning down my vintage computer holdings, to
> relieve some of the burden I will leave to my heirs (hopefully not too
> soon!).
>
> I have a working tiny PDP-11/73 system available for sale.  I would much
> prefer not to have to break it down and pack it for shipping, but I will if
> the buyer agrees to pay for the packing and shipping costs.
>
> - - - - -
>
> Tiny PDP-11/73 System:
>
> H9281-BA backplane and card cage
> KDJ11-A CPU
> DLV11-J 4 port SIO
> MSV11-LK 256KB/128KW memory
> Emulex UC07 SCSI interface
>
> Power-on Reset board from here:
> http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por <
> http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por>
>
> SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed
>
> MeanWell RT-125B power supply
>
> 4.5 inch AC fan
>
> qty 4 GlitchWorks serial cables
>
> Spare PDP-11/23 CPU saved as a backup:
> KDF11-AB CPU
>
> RT-11 Pocket Guide
>
> RT-11 Mini-Reference Manual
>
> - - - - -
>
> I am asking $800.00 for the lot.  It cost me about that, probably more to
> acquire it piece-by-piece and assemble it into a working system.
>
> smp
> - - -
> Stephen Pereira
> Bedford, NH  03110
> KB1SXE
>
>
>

Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

I am in the process of thinning down my vintage computer holdings, to relieve 
some of the burden I will leave to my heirs (hopefully not too soon!).

I have a working tiny PDP-11/73 system available for sale.  I would much prefer 
not to have to break it down and pack it for shipping, but I will if the buyer 
agrees to pay for the packing and shipping costs.

- - - - -

Tiny PDP-11/73 System:

H9281-BA backplane and card cage
KDJ11-A CPU
DLV11-J 4 port SIO
MSV11-LK 256KB/128KW memory
Emulex UC07 SCSI interface

Power-on Reset board from here:
http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por 


SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed

MeanWell RT-125B power supply

4.5 inch AC fan

qty 4 GlitchWorks serial cables

Spare PDP-11/23 CPU saved as a backup:
KDF11-AB CPU

RT-11 Pocket Guide

RT-11 Mini-Reference Manual

- - - - -

I am asking $800.00 for the lot.  It cost me about that, probably more to 
acquire it piece-by-piece and assemble it into a working system.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Tiny PDP-11/73 system for sale

[Stephen Pereira via cctalk]

I am in the process of thinning down my vintage computer holdings, to relieve 
some of the burden I will leave to my heirs (hopefully not too soon!).

I have a working tiny PDP-11/73 system available for sale.  I would much prefer 
not to have to break it down and pack it for shipping, but I will if the buyer 
agrees to pay for the packing and shipping costs.

- - - - -

Tiny PDP-11/73 System:

H9281-BA backplane and card cage
KDJ11-A CPU
DLV11-J 4 port SIO
MSV11-LK 256KB/128KW memory
Emulex UC07 SCSI interface

Power-on Reset board from here:
http://www.heeltoe.com/index.php?n=Pcbs.Qbus-por

SCSI-to-SD hard drive emulator with 4 drives available, RT-11 installed

MeanWell RT-125B power supply

4.5 inch AC fan

qty 4 GlitchWorks serial cables

Spare PDP-11/23 CPU saved as a backup:
KDF11-AB CPU

RT-11 Pocket Guide

RT-11 Mini-Reference Manual

- - - - -

I am asking $800.00 for the lot.  It cost me about that, probably more to 
acquire it piece-by-piece and assemble it into a working system.

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE

Re: WARNING: Clear QIC Tape Bands

[Alan Perry via cctalk]

> On Jan 20, 2022, at 00:23, Christian Corti via cctech  
> wrote:
> 
> On Wed, 19 Jan 2022, Jonathan Chapman wrote:
>> Just as a follow-up, I retensioned and read both tapes with clear bands this 
>> morning, and they're fine. Since they were parked, there shouldn't have been 
>> anything important there, and it looks like the removed oxide is staying on 
>> the band.
> 
> What bands did you use/buy? I ask because the Baumgartens Plastibands aren't 
> available in the required size (as if they are not produced any more).
> 

I bought the assorted sizes pack (SF-7000, I think). Each pack had maybe 10 of 
the green ones I use in QIC tape carts, so I bought multiple packs and put the 
rest of the bands into household use.

alan

Sun 3/260 on eBay; Boston area

[Peter Schow via cctalk]

Local pickup only.

https://www.ebay.com/itm/265510502961

RE: Building a BA08 for a pdp8/L

[pbirkel--- via cctalk]

Not a direct answer Chris, but back in the mid-70's I built a BM8 surrogate the 
hard way (we were an impoverished neurophysiology lab so cutting corners 
wherever reasonable) using banks of 2102L and S100 RAM PCBs.  For density I 
piggy-backed the 2102's to get 8Kbyte boards, then 3 boards gave 16Kword, so 6 
RAM boards were sufficient to fill out the memory space.  The controller was a 
1:1 implementation of the DEC schematic, which (if memory serves) just fit onto 
a single S100 prototyping board.  Cabling from the 8/L was simple ribbon with 
alternating grounds.  Chassis was ad hoc using a S100 backplane suitably 
reinterpreted plus a pair of 8" fans. Added suitable additional DF/IF switches 
and lamps to the existing filler-panel and then attached that to the 
chassis-front so that it all looked pretty good.  It worked for many years 
without incident, although AFAIK only core memory was used for execution; the 
SRAM was used only for data -- and every added word was taken advantage of :-}.

So there's an existence proof that what you propose isn't unreasonable.  I'd 
probably have preferred to have a nice backplane and applicable modules to WW, 
but point-to-point wiring on the prototyping board worked.  Given my skill-set 
at the time it was a rather risky venture, but the ROI was excellent.  
Evidently the DEC design was forgiving enough that my recreation worked on the 
first try.

If you decide to pursue the FPGA (or something) approach I'd be interested in 
doing the same with my current 8/L.  If you go that route, might as well build 
out all three bits of DF/IF control even if there may not be any accompanying 
front-panel.

-Original Message-
From: cctalk  On Behalf Of Chris Zach via cctalk
Sent: Wednesday, January 19, 2022 11:08 PM
To: CCTalk mailing list 
Subject: Building a BA08 for a pdp8/L

So now that my pdp8/L is up and running (it now has a serial port and runs 
FOCAL69 quite well) I'm thinking about the next step, which is of course more 
memory.

This requires a BA08 or BM8/L or something expansion box but to be honest I 
have enough spare flip chips and such from the wrecked 8/I to build about 3 
core memory systems. So given that the schematics for the
BA08 are online, they look pretty darn simple, I have the parts, and I have the 
parts does anyone know if it's possible to get a flip chip backplane to work on 
and wire up to emulate a BA08?

It looks like they just used the data break interface lines to hook up to the 
processor. Everything's there, Memory address bus, memory data bus, and the 
various signals for jumps and the like that could allow one to decode and 
implement the extra instructions needed.

Hm. Might just be easier to build it with an FPGA or something as it's mostly 
linking up simple gates and the whole core memory section could be removed by a 
4k*12 memory array. Anyone ever done this?

C

Re: WARNING: Clear QIC Tape Bands

[Christian Corti via cctalk]

On Wed, 19 Jan 2022, Jonathan Chapman wrote:
Just as a follow-up, I retensioned and read both tapes with clear bands 
this morning, and they're fine. Since they were parked, there shouldn't 
have been anything important there, and it looks like the removed oxide 
is staying on the band.


What bands did you use/buy? I ask because the Baumgartens Plastibands 
aren't available in the required size (as if they are not produced any 
more).


Christian